Q16 of 50 Page 17

 Name the planets that were known to ancient astronomers.

Planets known to ancient astronomers are:(a) Budh (Mercury)(b) Shukra (Venus)(c) Prithvi (Earth)(d) Mangal (Mars)(e) Brihaspati (Jupiter)(f) Shani (Saturn)

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14 Why do stars appear to be permanent to us even though these are born, grow and then die? 15 Which planet of the solar system is (a) largest and (b) smallest in size? 17 Name the planet that was predicted before it was actually observed.  18 What are planets? How is a planet different from a star?